:root {
  --sky: #5b8cff;
  --indigo: #6e5bff;
  --mint: #8ae5d1;
  --coral: #ff8f8f;
  --sun: #ffd66b;
  --ink: #172033;
  --slate: #5e6b84;
  --cloud: #f6f8fc;
  --mist: #eef3ff;
  --surface: rgba(255, 255, 255, 0.88);
  --surface-strong: rgba(255, 255, 255, 0.96);
  --line: rgba(91, 140, 255, 0.12);
  --shadow-soft: 0 18px 52px rgba(38, 73, 141, 0.12);
  --shadow-device: 0 22px 52px rgba(23, 32, 51, 0.18);
  --radius-xl: 34px;
  --radius-lg: 28px;
  --radius-md: 22px;
  --max-width: 1200px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: "Segoe UI Variable Display", "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background:
    radial-gradient(circle at top left, rgba(91, 140, 255, 0.18), transparent 24%),
    radial-gradient(circle at 88% 10%, rgba(138, 229, 209, 0.2), transparent 18%),
    linear-gradient(180deg, #f9fbff 0%, #f4f8ff 42%, #eef3ff 100%);
}

img,
video {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

code {
  padding: 0.2rem 0.45rem;
  border-radius: 999px;
  background: rgba(91, 140, 255, 0.1);
  color: var(--sky);
  font-size: 0.94em;
}

.badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.18rem 0.56rem;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  line-height: 1;
  white-space: nowrap;
  vertical-align: middle;
}

.badge-soon {
  color: #8a5a00;
  background: linear-gradient(135deg, rgba(255, 222, 136, 0.92), rgba(255, 244, 209, 0.96));
  border: 1px solid rgba(224, 167, 40, 0.22);
  box-shadow: 0 6px 14px rgba(224, 167, 40, 0.12);
}

.badge-link {
  color: #3753a6;
  background: linear-gradient(135deg, rgba(223, 234, 255, 0.96), rgba(240, 246, 255, 0.96));
  border: 1px solid rgba(91, 140, 255, 0.18);
}

.page-shell {
  width: min(100%, var(--max-width));
  margin: 0 auto;
  padding: 28px 20px 84px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
}

.brand-logo {
  width: 54px;
  height: 54px;
  border-radius: 18px;
  box-shadow: var(--shadow-soft);
}

.brand-copy {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.brand-copy strong {
  font-size: 1.08rem;
  letter-spacing: 0.01em;
}

.brand-copy span,
.topnav a {
  color: var(--slate);
  font-size: 0.95rem;
}

.brand-credit {
  color: #7c8aa6;
  font-size: 0.78rem;
  letter-spacing: 0.02em;
}

.topnav {
  display: flex;
  align-items: center;
  gap: 12px;
}

.topnav a {
  transition: background-color 180ms ease, color 180ms ease;
}

.topnav a:hover {
  background: rgba(91, 140, 255, 0.08);
  color: var(--ink);
}

.hero {
  padding-top: 10px;
}

.hero-panel {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(360px, 470px);
  gap: 28px;
  margin-top: 24px;
  padding: 24px;
  border: 1px solid rgba(255, 255, 255, 0.7);
  border-radius: 40px;
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.88), rgba(238, 243, 255, 0.92)),
    linear-gradient(180deg, rgba(91, 140, 255, 0.08), rgba(138, 229, 209, 0.06));
  box-shadow: var(--shadow-soft);
  overflow: hidden;
}

.hero-copy {
  position: relative;
  padding: 18px 8px 18px 10px;
}

.eyebrow,
.section-label {
  margin: 0 0 14px;
  color: var(--sky);
  font-size: 0.94rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.future-section-label {
  display: block;
  color: #4b5f8a;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: none;
}

.hero-copy h1,
.section-heading h2 {
  margin: 0;
  letter-spacing: -0.04em;
  line-height: 1.04;
}

.hero-copy h1 {
  max-width: none;
  font-size: clamp(2.8rem, 5vw, 5.1rem);
  line-height: 0.96;
  text-wrap: balance;
}

.hero-text,
.section-heading p,
.screen-card figcaption span,
.feature-card p,
.timeline-step p,
.demo-note li {
  color: var(--slate);
  line-height: 1.78;
}

.hero-text {
  max-width: 60ch;
  margin: 22px 0 0;
  font-size: 1.05rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 28px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 154px;
  min-height: 54px;
  padding: 0 22px;
  border-radius: 999px;
  font-weight: 700;
  transition: transform 180ms ease, box-shadow 180ms ease;
}

.button-nav {
  min-width: auto;
  min-height: 46px;
  padding: 0 20px;
  font-size: 0.98rem;
  font-weight: 800;
  letter-spacing: 0.01em;
  white-space: nowrap;
}

.button:hover {
  transform: translateY(-1px);
}

.button-primary {
  color: white;
  background: linear-gradient(135deg, #3d68ff, #5a4ff0);
  border: 1px solid rgba(56, 86, 214, 0.22);
  box-shadow: 0 16px 34px rgba(72, 98, 228, 0.34);
  text-shadow: 0 1px 2px rgba(13, 20, 36, 0.34);
}

.topnav .button-primary,
.topnav .button-primary:visited,
.topnav .button-primary:hover,
.topnav .button-primary:active {
  color: #ffffff;
}

.topnav .button-primary:hover {
  background: linear-gradient(135deg, #355fff, #5145ec);
}

.button-secondary {
  background: rgba(255, 255, 255, 0.68);
  border: 1px solid rgba(91, 140, 255, 0.12);
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.hero-tags li {
  position: relative;
  flex: 0 0 auto;
  width: fit-content;
  max-width: 100%;
  padding: 16px 18px 16px 44px;
  border: 1px solid rgba(91, 140, 255, 0.12);
  color: var(--ink);
  font-weight: 600;
  letter-spacing: -0.01em;
  box-shadow: 0 10px 24px rgba(39, 72, 138, 0.08);
}

.hero-tag-link {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  color: inherit;
}

.hero-tags .badge {
  margin-left: 0.45rem;
}

.hero-tags li::before {
  content: "";
  position: absolute;
  left: 18px;
  top: 50%;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  transform: translateY(-50%);
}

.hero-tags li:nth-child(1) {
  border-radius: 999px;
  background: linear-gradient(135deg, rgba(234, 241, 255, 0.96), rgba(255, 255, 255, 0.92));
}

.hero-tags li:nth-child(1)::before {
  background: var(--sky);
  box-shadow: 0 0 0 5px rgba(91, 140, 255, 0.12);
}

.hero-tags li:nth-child(2) {
  border-radius: 999px;
  background: linear-gradient(135deg, rgba(232, 251, 246, 0.96), rgba(255, 255, 255, 0.94));
}

.hero-tags li:nth-child(2)::before {
  background: #37b99a;
  box-shadow: 0 0 0 5px rgba(55, 185, 154, 0.12);
}

.hero-tags li:nth-child(3) {
  border-radius: 999px;
  background: linear-gradient(135deg, rgba(240, 237, 255, 0.96), rgba(255, 255, 255, 0.94));
}

.hero-tags li:nth-child(3)::before {
  background: var(--indigo);
  box-shadow: 0 0 0 5px rgba(110, 91, 255, 0.12);
}

.hero-tags li:nth-child(4) {
  border-radius: 999px;
  background: linear-gradient(135deg, rgba(255, 243, 200, 0.94), rgba(255, 255, 255, 0.94));
}

.hero-tags li:nth-child(4)::before {
  background: #e0a728;
  box-shadow: 0 0 0 5px rgba(224, 167, 40, 0.12);
}

.hero-tags li:nth-child(5) {
  border-radius: 999px;
  background: linear-gradient(135deg, rgba(255, 229, 240, 0.96), rgba(255, 255, 255, 0.94));
}

.hero-tags li:nth-child(5)::before {
  background: #d96a95;
  box-shadow: 0 0 0 5px rgba(217, 106, 149, 0.12);
}

.hero-tags li:nth-child(6) {
  border-radius: 999px;
  background: linear-gradient(135deg, rgba(229, 240, 255, 0.96), rgba(255, 255, 255, 0.94));
}

.hero-tags li:nth-child(6)::before {
  background: #4c78df;
  box-shadow: 0 0 0 5px rgba(76, 120, 223, 0.12);
}

.hero-devices {
  position: relative;
  min-height: 860px;
  isolation: isolate;
}

.device-frame {
  position: absolute;
  overflow: hidden;
  aspect-ratio: 1080 / 2215;
  border-radius: 34px;
  border: 8px solid #0d1424;
  background: #0f1523;
  box-shadow: var(--shadow-device);
  cursor: pointer;
  transition: transform 240ms ease, box-shadow 240ms ease, opacity 240ms ease, filter 240ms ease;
  transform-origin: center center;
  will-change: transform;
}

.device-frame::before {
  content: "";
  position: absolute;
  top: 10px;
  left: 50%;
  width: 22%;
  height: 6px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.14);
  transform: translateX(-50%);
  z-index: 1;
}

.device-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-devices:hover .device-frame,
.hero-devices.is-interacting .device-frame {
  opacity: 1;
  filter: saturate(0.94) brightness(0.96);
}

.hero-devices:hover .device-frame:not(:hover),
.hero-devices.is-interacting .device-frame:not(.is-active) {
  transform: scale(0.92);
  box-shadow: 0 18px 40px rgba(23, 32, 51, 0.16);
}

.device-frame:hover,
.device-frame:focus-within,
.device-frame.is-active {
  opacity: 1;
  filter: none;
  box-shadow: 0 36px 88px rgba(23, 32, 51, 0.34);
  z-index: 12;
}

.device-main:hover,
.device-main:focus-within,
.device-main.is-active {
  transform: translate(-18px, -18px) scale(1.16);
}

.device-create:hover,
.device-create:focus-within,
.device-create.is-active {
  transform: translate(24px, -30px) scale(1.34);
}

.device-feed:hover,
.device-feed:focus-within,
.device-feed.is-active {
  transform: translate(16px, -38px) scale(1.48);
}

.device-main {
  width: 356px;
  left: 0;
  top: 0;
  z-index: 2;
}

.device-create {
  width: 236px;
  right: 48px;
  top: 36px;
  z-index: 3;
  opacity: 0.96;
}

.device-feed {
  width: 246px;
  right: 78px;
  bottom: 8px;
  z-index: 5;
}

.section {
  padding-top: 86px;
}

.section-heading {
  max-width: 820px;
  margin-bottom: 28px;
}

.section-heading h2 {
  font-size: clamp(2rem, 3.7vw, 3.3rem);
}

.section-heading p {
  margin: 14px 0 0;
}

.screen-grid,
.feature-grid,
.timeline,
.demo-grid {
  display: grid;
  gap: 18px;
}

.screen-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
}

.screen-card,
.feature-card,
.timeline-step,
.demo-item {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow-soft);
}

.screen-card {
  margin: 0;
  position: relative;
  overflow: visible;
  transition: transform 220ms ease, box-shadow 220ms ease;
  transform-origin: center top;
}

.screen-card:hover,
.screen-card:focus-within {
  transform: translateY(-10px) scale(1.22);
  box-shadow: 0 26px 60px rgba(23, 32, 51, 0.22);
  z-index: 5;
}

.screen-card-media {
  position: relative;
  display: block;
  width: 100%;
  padding: 0;
  border: 0;
  background: transparent;
  overflow: hidden;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  cursor: default;
}

.screen-card-media::after {
  content: "悬停放大预览";
  position: absolute;
  right: 12px;
  bottom: 12px;
  padding: 0.36rem 0.62rem;
  border-radius: 999px;
  background: rgba(15, 21, 35, 0.8);
  color: rgba(255, 255, 255, 0.92);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  opacity: 0;
  transform: translateY(4px);
  transition: opacity 180ms ease, transform 180ms ease;
}

.screen-card-media:hover::after,
.screen-card-media:focus-visible::after {
  opacity: 1;
  transform: translateY(0);
}

.screen-card-media:focus-visible {
  outline: 3px solid rgba(91, 140, 255, 0.34);
  outline-offset: -3px;
}

.screen-card img {
  width: 100%;
  aspect-ratio: 9 / 18.6;
  object-fit: cover;
  background: #dfe8fb;
  transition: transform 260ms ease;
}

.screen-card:hover img,
.screen-card:focus-within img {
  transform: scale(1.08);
}

.screen-card figcaption {
  display: grid;
  gap: 8px;
  padding: 24px;
}

.screen-card figcaption strong,
.feature-card h3,
.timeline-step h3,
.demo-note h3 {
  font-size: 1.18rem;
  text-wrap: balance;
}

.screen-card figcaption span {
  font-size: 1.02rem;
}

.feature-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.features-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.future-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.feature-card {
  padding: 24px;
}

.feature-card h3,
.timeline-step h3,
.demo-note h3 {
  margin: 0 0 10px;
}

.feature-card h3 .badge,
.demo-caption strong .badge,
.eyebrow .badge,
.timeline-step p .badge {
  margin-left: 0.42rem;
}

.tone-blue {
  background: linear-gradient(180deg, rgba(234, 241, 255, 0.92), rgba(255, 255, 255, 0.92));
}

.tone-mint {
  background: linear-gradient(180deg, rgba(232, 251, 246, 0.92), rgba(255, 255, 255, 0.92));
}

.tone-indigo {
  background: linear-gradient(180deg, rgba(240, 237, 255, 0.94), rgba(255, 255, 255, 0.92));
}

.tone-peach {
  background: linear-gradient(180deg, rgba(255, 231, 222, 0.92), rgba(255, 255, 255, 0.92));
}

.tone-rose {
  background: linear-gradient(180deg, rgba(255, 229, 240, 0.94), rgba(255, 255, 255, 0.92));
}

.tone-butter {
  background: linear-gradient(180deg, rgba(255, 243, 200, 0.9), rgba(255, 255, 255, 0.94));
}

.workflow .timeline {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.timeline-step {
  padding: 24px;
}

.timeline-step h3 {
  font-size: 1.24rem;
}

.timeline-step p {
  font-size: 1.12rem;
  line-height: 1.82;
}

.step-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  margin-bottom: 14px;
  border-radius: 16px;
  background: linear-gradient(135deg, rgba(91, 140, 255, 0.12), rgba(138, 229, 209, 0.2));
  color: var(--sky);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.14em;
}

.demo-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.demo-item {
  padding: 16px;
}

.video-shell {
  padding: 10px;
  border-radius: 24px;
  background: linear-gradient(180deg, #1a2236, #0f1523);
}

.demo-video {
  width: 100%;
  aspect-ratio: 9 / 19.5;
  object-fit: cover;
  border-radius: 18px;
  background: #0f1523;
}

.demo-caption {
  display: grid;
  gap: 6px;
  padding: 14px 6px 4px;
}

.demo-caption strong {
  font-size: 1rem;
  text-wrap: balance;
}

.demo-caption span {
  color: var(--slate);
  line-height: 1.65;
  font-size: 0.95rem;
}

.footer {
  padding-top: 58px;
  color: var(--slate);
  text-align: center;
}

@keyframes float-main {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

@keyframes float-card {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-14px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .device-main,
  .device-create,
  .device-feed,
  .button {
    animation: none;
    transition: none;
  }
}

@media (max-width: 1120px) {
  .hero-panel {
    grid-template-columns: 1fr;
  }

  .hero-copy h1 {
    max-width: none;
  }

  .hero-devices {
    min-height: 700px;
  }

  .screen-grid,
  .workflow .timeline,
  .demo-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .features-grid,
  .future-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 760px) {
  .page-shell {
    padding-inline: 14px;
  }

  .topbar {
    flex-direction: column;
    align-items: flex-start;
  }

  .topnav {
    flex-wrap: wrap;
    gap: 10px;
  }

  .hero-panel {
    padding: 18px;
  }

  .hero-tags,
  .screen-grid,
  .workflow .timeline,
  .demo-grid {
    grid-template-columns: 1fr;
  }

  .features-grid,
  .future-grid {
    grid-template-columns: 1fr;
  }

  .hero-tags {
    display: grid;
  }

  .hero-tags li {
    width: 100%;
  }

  .hero-devices {
    min-height: auto;
    display: grid;
    gap: 16px;
  }

  .device-frame {
    position: static;
    width: 100%;
  }

  .device-frame:hover,
  .device-frame:focus-within {
    transform: none;
  }

  .section {
    padding-top: 62px;
  }

  .screen-card:hover,
  .screen-card:focus-within {
    transform: none;
  }
}